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Add tests for parser errors

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This commit is contained in:
Jeff 2024-10-05 05:57:28 -04:00
parent 437a6bf164
commit 35f73d60f0
2 changed files with 49 additions and 1 deletions
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33
dust-lang/src/parser.rs
View File

@ -916,6 +916,7 @@ impl<'src> Parser<'src> {
fn parse(&mut self, precedence: Precedence) -> Result<(), ParseError> {
let allow_assignment = precedence < Precedence::Assignment;
let allow_return = precedence == Precedence::None;
let mut parsed = false;
if let Some(prefix_parser) = ParseRule::from(&self.current_token.kind()).prefix {
log::debug!(
@ -924,6 +925,7 @@ impl<'src> Parser<'src> {
);
prefix_parser(self, allow_assignment, allow_return)?;
parsed = true;
}
let mut infix_rule = ParseRule::from(&self.current_token.kind());
@ -948,9 +950,38 @@ impl<'src> Parser<'src> {
}
infix_rule = ParseRule::from(&self.current_token.kind());
parsed = true;
}
Ok(())
if parsed {
Ok(())
} else {
Err(ParseError::ExpectedTokenMultiple {
expected: &[
// This should list all infix operators and the semicolon token
TokenKind::BangEqual,
TokenKind::DoubleAmpersand,
TokenKind::DoublePipe,
TokenKind::DoubleEqual,
TokenKind::Greater,
TokenKind::GreaterEqual,
TokenKind::Less,
TokenKind::LessEqual,
TokenKind::Minus,
TokenKind::MinusEqual,
TokenKind::Percent,
TokenKind::Plus,
TokenKind::PlusEqual,
TokenKind::Star,
TokenKind::StarEqual,
TokenKind::Semicolon,
TokenKind::Slash,
TokenKind::SlashEqual,
],
found: self.current_token.to_owned(),
position: self.current_position,
})
}
}
}

17
dust-lang/tests/parse_errors.rs
View File

@ -63,3 +63,20 @@ fn subtract_assign_expects_variable() {
})
);
}
#[test]
fn let_statement_expects_identifier() {
let source = "let 1 = 2";
assert_eq!(
parse(source),
Err(DustError::Parse {
error: ParseError::ExpectedToken {
expected: TokenKind::Identifier,
found: Token::Integer("1").to_owned(),
position: Span(4, 5)
},
source
})
);
}